how to install python 3 in ubuntu 16.04

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root@Mitaka-lab:~# apt-get install python3.4 python3.4-dev Reading package lists… Done Building dependency tree Reading state information… Done Note, selecting ‘libpython3.4-minimal’ for regex ‘python3.4’ E: Unable to locate package python3.4-dev E: Couldn’t find any package by glob ‘python3.4-dev’ E: Couldn’t find any package by regex ‘python3.4-dev’ root@Mitaka-lab:~# python --version Python 2.7.12 root@Mitaka-lab:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.1 LTS Release: 16.04 Codename: xenial root@Mitaka-lab:~# which python /usr/bin/python root@Mitaka-lab:~#

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As of Ubuntu 16.04 LTS, Python 3 is default Python! Python 2 is only installed only when needed by packages - but because there is a lot packages who depends on it, so some package surely installed it too.

Keep in mind that Python 3 must be called by python3. python is reserved for Python 2, so it doesn’t break packages who depends on it.

Verify do you have python 3 by executing

python3 --version

Also you can get location of it by executing

which python3

Edit: reformatting answer…

i run python3 --version it show python 3.5.2

which python3 is /usr/bin/python3